Terminal-Based TRP Synchronization for Multi-TRP Joint Transmission
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Solution Overview
Problem
In multi-TRP communication systems, such as 5G and 6G, achieving synchronization between transmission and reception points (TRPs) is crucial for joint transmission and reception, but existing methods lack efficiency in acquiring and maintaining this synchronization.
Innovation Solution
A method where a terminal receives downlink reference signals from multiple TRPs, reports measurement data based on these signals, and receives data through joint transmission performed by the TRPs based on the measurement report. This method includes using synchronization signal blocks, channel state information reference signals, or tracking reference signals, and can report time and frequency offsets or joint offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP communication is implemented to improve communication performance, then data transmission reliability is improved, but synchronization acquisition complexity increases
Solution Approach 1:
The terminal acts as an intermediary that measures downlink reference signals from multiple TRPs and reports measurement results (time offset, frequency offset, or joint offset) to one TRP. This intermediary approach enables synchronization acquisition between TRPs without requiring direct complex interaction between TRPs themselves, thus improving communication reliability while managing synchronization complexity through the terminal's measurement and reporting function
2Productivity
If joint transmission is performed between multiple TRPs to improve data transmission efficiency, then productivity is improved, but coordination overhead increases
Solution Approach 1:
The terminal performs preliminary measurement of downlink reference signals from multiple TRPs and reports the measurement results (time offset, frequency offset, or joint offset) before joint transmission begins. This preliminary action provides the necessary synchronization information in advance, enabling efficient joint transmission between TRPs while minimizing coordination overhead during actual data transmission
3Measurement precision
If multiple reference signals are measured to acquire synchronization, then measurement precision is improved, but measurement time increases
Solution Approach 1:
The terminal extracts and reports only the essential synchronization information (time offset, frequency offset, or joint offset) from the measured downlink reference signals, rather than reporting all raw measurement data. This extraction approach maintains synchronization precision while reducing measurement and processing time by focusing only on the critical parameters needed for TRP synchronization
Data Source
AI summary
A method of a terminal may comprise: receiving a first downlink (DL)-reference signal (RS) and a second DL-RS from a first transmission and reception point (TRP) and a second TRP among two or more TRPs; reporting a measurement report based on the first DL-RS and the second DL-RS to one TRP among the first TRP and the second TRP; and receiving data through joint transmission performed by the first TRP and the second TRP based on the measurement report.